Perhaps you should try some spelling variations:
loi viet » loai viet, hoi viet, doi viet
cau lanh » cau danh, cay lanh, dau lanh
cau lan » cao lan, sau lan, cau van
oi viet » hoi viet, o viet, cuoi viet
cho cay » cho cac, cho vay, cho can
cay co » cac co, cay cong
co loi » co hoi
va cho » van cho, va che, va chi
va cao » va cac, va dao, va bao
tay co » ty co, tay o
va co » vo co
co oi » co hoi, co doi, co toi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( cong trinh ((cau lan) or (cau lanh)) va cho cay co loi viet nam ) or ( chuong trinh ((cau lan) or (cau lanh)) ((va cao) OR (va co)) tay co oi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh ((cau lan) OR (cau lanh)) va cho cay co loi viet nam ) OR ( chuong trinh ((cau lan) OR (cau lanh)) ((va cao) OR (va co)) tay co oi viet nam ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh ((cau lan) or (cau lanh)) va cho cay co loi viet nam ) or ( chuong trinh ((cau lan) or (cau lanh)) ((va cao) OR (va co)) tay co oi viet nam ))*".